In Wikipedia's case, the text is (well, at least so far), written by actual humans. And no matter what you think about the ethics of Wikipedia editors, they are humans also. Human oversight is required for Wikipedia to function properly. If Wikipedia were to go to a model where some AI crawls the web for knowledge and writes articles based on that with limited human involvement, then it would be similar. But that's not what they are doing.
The Internet Archive is on a bit less steady legal ground (see the resent legal actions), but in its favor it is only storing information for archival and lending purposes, and not using that information to generate derivative works which it is then selling. (And it is the lending that is getting it into trouble right now, not the archiving).